OTHER ANSWERS

If you're trying to create an email address with your second domain in Cpanel, the domain is available in the drop-down menu. However, that domain is currently pointed to WIX, so all internet traffic currently goes their until your DNS changes take effect - this period of delay is called propagation. Here's an article on it: Propagation due to DNS changes. Basically, the internet servers do not yet know you've made changes to your internet server. It takes time for that information to be shared. After the propagation period finishes, then you should be able to use your website settings as you have set them in DNS.

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